From the perspective of someone who has transitioned pretty much completely from SL to MMO land (Elder scrolls online), RP in a MMO like Archeage is asking for drama. I would say Conan would be a better spot, plus you can spin up your own private server or find one that's "Adult Themed RP" friendly. Just my opinion.

"Old stories are like old friends. You have to visit them from time to time." Bran - A Storm of Swords, pg 315

I've yet to install the game myself, if there are Gorean RP servers it should show up in a search.You'll want to install Discord too, it tends to be popular with games like these for keeping up with your server's community.

Roll20 is something I've been meaning to try when I get time to game. Looks to be quite active with many games to join.